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Describe a roller coaster in three sentences.
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A roller coaster is a type of amusement ride that features rapid ascents and descents along with sharp curves, loops, and drops. It is made of a steel track that is shaped in numerous ways and is meant to provide a thrilling, fast-paced ride for those on board. The experience of riding a roller coaster can range from exhilarating to stomach-turning, depending on the design of the attraction.